1、string对象中可以传正则的函数介绍

var text = "cat, bat, sat, fat"; var pattern = /.at/; var matches = text.match(pattern); alert(matches.index); //0 alert(matches[0]); //"cat" alert(pattern.lastIndex); //0 var pos = text.search(/at/); alert(pos); //1 var result = text.replace("at", "ond"); alert(result); //"cond, bat, sat, fat" result = text.replace(/at/g, "ond"); alert(result); //"cond, bond, sond, fond" result = text.replace(/(.at)/g, "word ($1)"); alert(result); //word (cat), word (bat), word (sat), word (fat) function htmlEscape(text){ return text.replace(/[<>"&]/g, function(match, pos, originalText){ switch(match){ case "<": return "&lt;"; case ">": return "&gt;"; case "&": return "&amp;"; case "\"": return "&quot;"; } }); } alert(htmlEscape("<p class=\"greeting\">Hello world!</p>")); //&lt;p class=&quot;greeting&quot;&gt;Hello world!&lt;/p&gt; var colorText = "red,blue,green,yellow"; var colors1 = colorText.split(","); //["red", "blue", "green", "yellow"] var colors2 = colorText.split(",", 2); //["red", "blue"] var colors3 = colorText.split(/[^\,]+/); //["", ",", ",", ",", ""]

2、字符串转成小写和大写函数

var stringValue = "hello world"; alert(stringValue.toLocaleUpperCase()); //"HELLO WORLD" alert(stringValue.toUpperCase()); //"HELLO WORLD" alert(stringValue.toLocaleLowerCase()); //"hello world" alert(stringValue.toLowerCase()); //"hello world"

3、字符串对象 new String()

var stringObject = new String("hello world"); var stringValue = "hello world"; alert(typeof stringObject); //"object" alert(typeof stringValue); //"string" alert(stringObject instanceof String); //true alert(stringValue instanceof String); //false

4、字符串fromCharCode()方法

alert(String.fromCharCode(104, 101, 108, 108, 111)); //"hello"

5、字符串本地比较方法localeCompare（）

var stringValue = "yellow"; alert(stringValue.localeCompare("brick")); //1 alert(stringValue.localeCompare("yellow")); //0 alert(stringValue.localeCompare("zoo")); //-1 //preferred technique for using localeCompare() function determineOrder(value) { var result = stringValue.localeCompare(value); if (result < 0){ alert("The string 'yellow' comes before the string '" + value + "'."); } else if (result > 0) { alert("The string 'yellow' comes after the string '" + value + "'."); } else { alert("The string 'yellow' is equal to the string '" + value + "'."); } } determineOrder("brick"); determineOrder("yellow"); determineOrder("zoo");

6、indexOf() 和 lastIndexOf()方法

var stringValue = "hello world"; alert(stringValue.indexOf("o")); //4 alert(stringValue.lastIndexOf("o")); //7 alert(stringValue.indexOf("o", 6)); //7 alert(stringValue.lastIndexOf("o", 6)); //4

7、字符串常用字符截取方法

var stringValue = "hello world"; alert(stringValue.slice(3)); //"lo world" alert(stringValue.substring(3)); //"lo world" alert(stringValue.substr(3)); //"lo world" alert(stringValue.slice(3, 7)); //"lo w" alert(stringValue.substring(3,7)); //"lo w" alert(stringValue.substr(3, 7)); //"lo worl" alert(stringValue.slice(-3)); //"rld" alert(stringValue.substring(-3)); //"hello world" alert(stringValue.substr(-3)); //"rld" alert(stringValue.slice(3, -4)); //"lo w" alert(stringValue.substring(3, -4)); //"hel" alert(stringValue.substr(3, -4)); //"" (empty string)

以上就是今天的javascript学习小结，之后每天还会继续更新，希望大家继续关注。